Pressure device for drills.



' yBUn-"746,431

PATENTED DEU. E, 1903'.

E. H. 'AGAKEEMAE .A PRESSURE DEVICE EOE DEILEE.-v

APPLIOATIN FILED FEB. 19. 1903.

N0 MODEL.

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'UNITED STATES Patented December 8, 1903.

I PATENT OFFICE.

ELMER H. ACKERMAN, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO THE MONITORDRILL COMPANY, A CORPORATION OF MINNESOTA, AND JOHN MAHER, OFMINNEAPOLIS, MINNESOTA.

PRESSURE DEVICE FOR DRILLS.

SPECIFICATION forming part of Letters Patent No. 746,432, dated December8, 1903.

l Application led February 197.1903. Serial No. 144.051. (No model.)

similar machines; and to this end it consists x of the novel devices andcombinations of devices hereinafter described,and defined in the claims.

Theinvention is illustrated in the accompanying drawings, wherein likecharacters indizo cate like parts throughout the several views. Figure lis a view in longitudinal vertical section, taken centrally through amachiney having applied thereto one of my improved pressure devices.Fig. 2 is a plan View of one z 5 of the shoes and cooperating pressuredevice,

but in a different position. elevation of the parts shown in Fig.,2, andFig. 4. is a transverse vertical section on the line m4 x4 of Fig. 2.

3o The numeral 1 indicates the wheels, the

numeral 2 the frame, the numeral 3 the seedboX, the numeral 4 thefeed-spout, and the numeral 5 the pole, of the machine, which parts maybe of the standard or any suitable construction.

The numeral 6 indicates a rock shaft mounted in. suitable bearings 7 onthe rear portion of the frame 2 and provided with an operating-lever 8and with a plurality of forwardly-projecting arms 9, but one of whicharms are shown.

The numeral 10 indicates one of the drillshoes, the forwardend of whichis secured to a drag-bar 11, the forward end of which bar in turn ispivotally connected at 12 to the forward portion of the frame 2.4 Thefeed boot or leg 13 is rigidly secured at its lowerend in the usual waytothe rear end of the shoe l0.

Fig. 3 is a side` The numeral 14 indicates a pressure-bar 5o formed bytwo parallel straps, the forward ends of which are pivotally connectedto the drag-bar ll, preferably 'to the intermediate portion thereof. Thestraps of the pressurebar 14 straddle or embrace theboot or leg 13, 55and the rear ends thereof are spaced apart, but connected by a smallbracket 15.

The numeral 16 indicates a pressure-rod, the lower end of which ispivoted to the spacing-bracket 15 and the upper end of which 6o isconnected to a block 17, which in turn is pivotally connected to thefree end of the arm 9.

'The numeral 18 indicates a strong leafspring, the lower and rear end ofwhich is rigidlyconnected at 19 to the lower portion of the boot or leg13. The straps of the pressure-bar 14: at their intermediate portionsare provided with a series of perforations 20,

through any alined pair of which lnay be 7o passed a small bolt 21, uponwhich is loosely mounted an antifriction-roller 22,. The forward andupper end of the spring 18 presses against the under surface of theroller 22, and thus yieldingly forces the shoe l0 and 75 the leg or boot13 downward. The bolt 21 and roller 22 thus afford a reaction-bearingfor the spring 18, which reaction-bearing is carried by the machine andis relatively fixed with respect to said spring. The free end of 8o thesaid spring 18 is hooked or bent upward to form a stop 23, which when itengages the roller 22 limits the rearward traveling movement of thespring over the said roller.

The numeral 24 indicates a drag-chain at- 85 tached to the boot or leg13 and serving to close the furrow formed by the shoe l0. This chain,however, forms no part of my present invention.

My invention resides in the arrangement 9o of the shoe `or correspondingelement, the pressure-bar, and the spring whereby the improvedaction nowto be described is aecomplished. It will of course be understood that ina complete machine a plurality of the shoes, pressure-bars, and springswill be employed and that the several pressure devices may be operatedthrough the common rockshaft 6 and actuating-lever 8. In this case theshaft 6 would also be provided with a plurality of arms 9, only one ofwhich is shown in the drawings.

The springs or pressure devices hitherto employed for the purpose towhich this invention is directed have not afforded sucient freedom ofmovement to the shoes to permit them to freely ride or pass overstonesor other large obstructions within their path of travel. Otherwisestated, such springs on account of their comparatively small limit ofcompression would become rigid under movements frequently given to theshoes in passing over large stones and obstructions, thus frequentlycausing breakage to certain parts of the machine. By my arrangement ofthe spring so that at one end its force is applied to press downwardagainst the rear portion of the shoe and at the same timeis free to beforced upward between the straps of the pressure-bar 14, and the shoe isso mounted that it may be given a maximum upward movement and, in fact,may be moved so far upward that it passes the straps ot' the saidpressure-bar. In Fig. 3 the shoe is shown as moved upward nearly, butnot quite, to the extreme position just indicated. Furthermore, underthese extreme movements of the shoe the tension of the spring 18 is notvaried to any objectionable extent. The said spring is not at any timeforced anywhere near to the limit of its compression or elasticity. Byvarying the position of the roller 22 and bolt 21 the tension of thespring 18 may be increased or decreased, so as to give the vdesirednormal pressure on the shoe. The said roller 22 permits the free end ofthe spring 18 to travel over the same under a minimum of friction andincreases the efliciency of the spring to a considerable extent.

In practice it will be understood that any well-known or suitable meansmay be provided for locking the rock-shaft 6 and arms 9, andconsequently the pressure-bars 14, in any positions in which they may beset by the lever 8.

It will of course be understood that the device described is capable ofmodification within the scope of my invention as herein set forth andclaimed.

Theimproved pressure device mayof course be used to press into theground other forms of furrow-openers-such,forinstance,as disks and hoes.

A furrow-opening disk at the free end of the drag-bar would be theequivalent of a ground-shoe within the scope of this invention.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

1. In a machine of the character described, the combination with apivoted drag-bar provided at its free end with a ground-shoe, of aleaf-spring anchored at its rear end to a part carried at the free endof said drag-bar, and an adjustable reaction-bearing carried by themachine and against which the forwardly-projecting free end of saidleaf-spring bears and under which it travels, substantially asdescribed. 2. In a machine of the character described, the combinationwith the drag-bar 1l provided at its free end with a shoe, of apresserbar 14 formed by a pair of straps pivotally connected to saiddrag-bar and attached atits free end to said shoe,a roller-equipped boltapplied to the straps of said presser-bar, a pressure-spri n g 18rigidly attached atv its rear end to said shoe, and at its free endworking between the straps of said bar 14 and pressing against andtraveling under the roller of said bolt, and means for verticallyadjusting the rear end of said presser-bar, substantially as described.

3. In a machine of the character described, the combination with thedrag-bar 1l, provided at its rear end with a shoe 10, and a boot 13, ofthe pressure-bar 14, formed by a pair of straps pivotally connected tosaid drag-bar and embracing said boot 13, a rollerequipped boltadjustably secured to the straps of said bar 14, the pressure-spring 18,rigidly attached at its rear end to said rear portion of said shoe, andat its free end working between the straps of said bar 14 and againstthe roller of said bolt, and means for vertically adjusting the rear endof said pressure-bar, substantially as described.

In testimony whereof` I aliix my signature in presence of two witnesses.

ELMER H. ACKERMAN.

Witnesses:

GENEVIEVE HIRsoH, F. D. MERCHANT.

